Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Narrative (Details)

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Fair Value Measurements - Narrative (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 28, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Long-term debt $ 5,751,000   $ 5,751,000   $ 5,751,000     $ 9,685,000    
Change in fair value of convertible note embedded derivative liability     $ (1,658,000) $ 2,853,000 $ (6,310,000) $ 2,423,000        
Stock price (in dollars per share) $ 1.79 $ 1.51 $ 1.79 $ 0.68 $ 1.79 $ 0.68 $ 1.51 $ 0.94 $ 1.05 $ 0.99
Extinguishment of debt $ 1,368,000 $ 6,000,000 $ 1,368,000   $ 7,368,000          
Loss on extinguishment of debt         (2,526,000) $ 797,000        
Change in fair value of warrant liability     $ (898,000) $ 937,000 $ (2,526,000) $ 797,000        
Convertible note embedded derivative liability                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Stock price (in dollars per share) $ 1.79   $ 1.79   $ 1.79          
Convertible note embedded derivative liability | Level 3                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Loss on extinguishment of debt         $ 3,632,000          
Convertible notes                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Original discount                   $ 4,916,000
Notes converted $ 1,368,000 6,000,000                
Debt face amount 8,632,000   $ 8,632,000   8,632,000         $ 16,000,000
Debt issuance costs and discount 2,881,000   2,881,000   2,881,000     $ 6,315,000    
Long-term debt 5,751,000   $ 5,751,000   $ 5,751,000     $ 9,685,000    
Extinguishment of debt $ 911,000 $ 3,800,000